/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include <fstream>
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkStreamingImageFilter.h"
#include "itkMedianImageFilter.h"
#include "itkMetaImageIO.h"

int itkMetaImageStreamingIOTest(int ac, char* av[])
{
  //  Image types are defined below.
  using InputPixelType = unsigned char;
  using OutputPixelType = unsigned char;
  constexpr unsigned int Dimension = 3;

  using InputImageType = itk::Image< InputPixelType,  Dimension >;
  using OutputImageType = itk::Image< OutputPixelType, Dimension >;

  using ReaderType = itk::ImageFileReader< InputImageType  >;
  using WriterType = itk::ImageFileWriter< OutputImageType >;
  using IOType = itk::MetaImageIO;

  using FilterType = itk::MedianImageFilter< OutputImageType,
                                            OutputImageType >;

  using StreamingFilterType = itk::StreamingImageFilter< OutputImageType,
                                            OutputImageType >;

  FilterType::Pointer filter = FilterType::New();

  StreamingFilterType::Pointer streamer = StreamingFilterType::New();

  ReaderType::Pointer reader = ReaderType::New();
  WriterType::Pointer writer = WriterType::New();

  IOType::Pointer metaIn = IOType::New();
  IOType::Pointer metaOut = IOType::New();
  reader->SetImageIO(metaIn);
  writer->SetImageIO(metaOut);

  const std::string inputFilename  = av[1];
  const std::string outputFilename = av[2];

  reader->SetFileName( inputFilename  );
  reader->SetUseStreaming(true);

  writer->SetFileName( outputFilename );

  InputImageType::SizeType indexRadius;

  indexRadius[0] = 1; // radius along x
  indexRadius[1] = 1; // radius along y
  indexRadius[2] = 1; // radius along Z

  filter->SetRadius( indexRadius );

  //filter->SetInput( reader->GetOutput() );
  streamer->SetInput( reader->GetOutput() );
  writer->SetInput( streamer->GetOutput() );

  // test streaming check methods
  if (!metaIn->CanStreamRead())
    {
    std::cerr << "Failed stream read check" << std::endl;
    return EXIT_FAILURE;
    }
  if (!metaOut->CanStreamWrite())
    {
    std::cerr << "Failed stream write check" << std::endl;
    return EXIT_FAILURE;
    }

  // By default we decide to use 4 pieces, but this value can
  // be changed from the command line.
  unsigned int numberOfDataPieces = 4;
  if( ac > 3 )
    {
    numberOfDataPieces = std::stoi( av[3] );
    }

  streamer->SetNumberOfStreamDivisions( numberOfDataPieces );

  try
    {
    writer->Update();
    }
  catch( itk::ExceptionObject & err )
    {
    std::cerr << "ExceptionObject caught !" << std::endl;
    std::cerr << err << std::endl;
    return EXIT_FAILURE;
    }
  return EXIT_SUCCESS;
}
